CN112392937B - Torque transmission mechanism, electric starting device, engine and garden tool - Google Patents
Torque transmission mechanism, electric starting device, engine and garden tool Download PDFInfo
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- CN112392937B CN112392937B CN201910765273.8A CN201910765273A CN112392937B CN 112392937 B CN112392937 B CN 112392937B CN 201910765273 A CN201910765273 A CN 201910765273A CN 112392937 B CN112392937 B CN 112392937B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/12—Toothed members; Worms with body or rim assembled out of detachable parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/14—Construction providing resilience or vibration-damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to the technical field of garden tools, in particular to a torque transmission mechanism, an electric starting device, an engine and a garden tool. The torque transmission mechanism comprises a first transmission piece, a second transmission piece and an elastic buffer piece positioned between the first transmission piece and the second transmission piece, wherein the elastic buffer piece is configured to buffer and transmit the torque of the first transmission piece to the second transmission piece. Through adopting elastic buffer to transmit the moment of torsion for earlier by elastic buffer temporarily cushion in the moment of torsion transmission process of first transmission piece, transmit the moment of torsion for the second driving medium by elastic buffer afterwards, solved among the prior art between gear and the volute spring and between volute spring and the ratchet be connected collude the easy cracked problem of claw, elastic buffer makes simple process, with low costs, transmission noise is little moreover, the easy operation of dismouting need not additionally to install safety protection part.
Description
Technical Field
The invention relates to the technical field of garden tools, in particular to a torque transmission mechanism, an electric starting device, an engine and a garden tool.
Background
In the prior art, a small gasoline engine is generally provided with an electric starting device, the electric starting device generally comprises a starting motor, a power transmission mechanism and a clutch mechanism, the power transmission mechanism comprises a reduction gearbox and an energy storage assembly, in the starting stage of the small gasoline engine, torque output by the starting motor is transmitted to the energy storage assembly through the reduction gearbox, the energy storage assembly converts mechanical energy into potential energy, when the stored potential energy reaches a threshold value, the potential energy is released to the clutch mechanism instantly and rotates, and the clutch mechanism is meshed with a crankshaft and drives the crankshaft to rotate so as to start the gasoline engine. After the gasoline engine is started, the transmission between the clutch mechanism and the crankshaft is disconnected. Referring to fig. 1 and 2, the reduction gearbox is generally configured as a gear set comprising a gear 10' having a cavity capable of receiving an energy storage assembly; the energy storage assembly is generally configured such that a volute spring 20 'is accommodated in a cavity of the gear 10', and one end of the volute spring is connected with the gear 10 'and the other end is connected with a ratchet 30' of the clutch mechanism. The volute spring 20 ' is formed by winding an elongated spring material, and has an outer free end far away from the center of the spiral and an inner free end close to the center of the spiral, the inner free end is configured as a first hook 21 ', the outer free end is configured as a second hook 22 ', the ratchet 30 ' is provided at an inner circumferential surface thereof with a first groove 31 ' for fixing the first hook 21 ', and the gear 10 ' is provided at an inner circumferential surface thereof with a second groove 11 ' for fixing the second hook 22 '.
The defects of the prior art are that the torsion between the gear 10 'and the ratchet wheel 30' is buffered and transmitted by the volute spring 20 ', the manufacturing process of the volute spring 20' is complex, the cost is high, the transmission vibration is large, noise is generated, and the hook claws connected between the gear 10 'and the volute spring 20' and between the volute spring 20 'and the ratchet wheel 30' are easy to break. Meanwhile, in order to avoid hurting people due to the fact that the volute spring 20' pops out, safety protection is needed in the assembling process, an auxiliary tool is needed during disassembly and assembly, manpower is wasted, and efficiency is low.
Disclosure of Invention
The invention aims to provide a torque transmission mechanism, an electric starting device, an engine and a garden tool, which aim to solve the problems of complex manufacturing process, high cost, large transmission vibration, easy breakage of a hook claw, difficult disassembly and assembly and the like caused by the fact that a volute spring is adopted between a gear and a ratchet wheel in the conventional torque transmission mechanism to transmit torque.
In order to achieve the purpose, the invention adopts the following technical scheme:
a torque transmission mechanism comprises a first transmission piece, a second transmission piece and an elastic buffer piece located between the first transmission piece and the second transmission piece, wherein the elastic buffer piece is configured to buffer and transmit torque of the first transmission piece to the second transmission piece.
In a preferred embodiment of the torque transmission mechanism, the elastic buffer member is annular, an outer peripheral surface of the elastic buffer member is in elastic contact with the first transmission member, and an inner peripheral surface of the elastic buffer member is in elastic contact with the second transmission member.
As a preferred technical scheme of the torque transmission mechanism, a first transmission member cylinder is arranged on an inner end surface of the first transmission member, a second transmission member ring is arranged on an outer end surface of the second transmission member, the second transmission member ring is sleeved on the first transmission member cylinder, and the elastic buffer member is elastically extruded between an inner circular surface of the first transmission member and an outer circular surface of the second transmission member ring.
As a preferred solution for the torque-transmitting mechanism, the geometric centre and the rotation centre line of the first transmission cylinder are both located on the axis X; the geometric center of the elastic buffer piece is positioned on an axis Y, and the rotation center of the elastic buffer piece is positioned on the axis X; the geometric center of second driving medium ring is located on axis Y, the center of rotation of second driving medium ring is located on axis X, wherein axis X with axis Y is parallel to each other and the interval sets up.
Preferably, the eccentricity of the point on the axis Y with respect to the point on the axis X is 0.2 to 0.3.
As a preferred solution for the torque-transmitting mechanism, the eccentricity of a point on the axis Y with respect to a point on the axis X is 0.28.
As a preferred technical scheme of the torque transmission mechanism, the ratio of the inner circle radius of the elastic buffer part to the outer circle radius of the elastic buffer part is 0.4-0.5.
As a preferable embodiment of the torque transmission mechanism, a ratio of an inner circle radius of the elastic buffer member to an outer circle radius of the elastic buffer member is 0.46.
As a preferable technical solution of the torque transmission mechanism, a plurality of grooves are arranged on the inner circumferential surface of the first transmission member at intervals along the circumferential direction of the inner circumferential surface of the first transmission member.
As a preferable embodiment of the torque transmission mechanism, an end surface of the elastic buffer is provided with a chamfer.
Preferably, the outer circumferential surface of the elastic buffer member is engaged with the inner circumferential surface of the first transmission member, and the inner circumferential surface of the elastic buffer member is engaged with the outer circumferential surface of the second transmission member.
As a preferred technical solution of the torque transmission mechanism, a first clamping groove is formed in an outer circumferential surface of the elastic buffer member, a first clamping block is arranged in an inner circumferential surface of the first transmission member, and the first clamping block is clamped in the first clamping groove.
As a preferable technical solution of the torque transmission mechanism, a first gap is formed between the first clamping block and the first clamping groove, and/or between an outer circumferential surface of the elastic buffer member and an inner circumferential surface of the first transmission member.
As a preferred technical solution of the torque transmission mechanism, the first locking groove is of a fan-shaped structure, and the width of the first locking groove gradually increases along a direction in which the inner circumferential surface of the elastic buffer member points to the outer circumferential surface.
As a preferred technical solution of the torque transmission mechanism, a second clamping groove is formed in an inner peripheral surface of the elastic buffer member, a second clamping block is arranged in an outer peripheral surface of the second transmission member, and the second clamping block is clamped in the second clamping groove.
As a preferable technical solution of the torque transmission mechanism, a second gap is formed between the second clamping block and the second clamping groove, and/or between an inner circumferential surface of the elastic buffer member and an outer circumferential surface of the second transmission member.
As a preferred technical solution of the torque transmission mechanism, the second locking groove is of a fan-shaped structure, and the width of the second locking groove gradually increases along a direction in which the inner circumferential surface of the elastic buffer member points to the outer circumferential surface.
As a preferred technical scheme of the torque transmission mechanism, at least two first clamping grooves are arranged, and the at least two first clamping grooves are circumferentially and uniformly distributed on the outer peripheral surface of the elastic buffer piece;
and/or the number of the second clamping grooves is at least two, and the at least two second clamping grooves are uniformly distributed on the inner circumferential surface of the elastic buffer part in the circumferential direction.
Preferably, the elastic buffer is made of a polyurethane elastomer.
An electric launch device comprising a torque transmitting mechanism as described in any of the above aspects.
An electric starting engine comprises the electric starting device.
A garden tool comprises the electric starting engine.
The invention has the beneficial effects that:
the torque transmission mechanism comprises a first transmission piece, a second transmission piece and an elastic buffer piece positioned between the first transmission piece and the second transmission piece, wherein the elastic buffer piece is used for transmitting torque, so that the torque of the first transmission piece is temporarily buffered by the elastic buffer piece in the torque transmission process, and then the torque is transmitted to the second transmission piece by the elastic buffer piece, and the problem that in the prior art, a hook claw connected between a gear and a volute spring and between the volute spring and a ratchet wheel is easy to break is solved.
Drawings
FIG. 1 is a schematic illustration of a prior art torque-transmitting mechanism;
FIG. 2 is a schematic illustration of a prior art torque-transmitting mechanism configuration II;
FIG. 3 is an exploded view of the torque transmitting mechanism according to one embodiment of the present invention;
FIG. 4 is a front view of a torque-transmitting mechanism according to a first embodiment of the present invention;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is an exploded view of the torque transmitting mechanism according to embodiment two of the present invention;
FIG. 7 is a front elevational view of the torque transmitting mechanism in accordance with the second embodiment of the present invention;
FIG. 8 is a sectional view taken in the direction B-B in FIG. 4;
fig. 9 is an assembled structural sectional view of a torque transmitting mechanism according to a second embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
The present embodiment provides a torque transmission mechanism, as shown in fig. 3-5, including a first transmission member 10, a second transmission member 30, and an elastic buffer member 20 located between the first transmission member 10 and the second transmission member 30, wherein the elastic buffer member 20 forms elastic pressing surfaces with the first transmission member 10 and the second transmission member 30 respectively and generates static friction force, and the torque of the first transmission member 10 is transmitted to the second transmission member 30 by the static friction force. In the embodiment, the first transmission member 10 is a gear, and the second transmission member 30 is a ratchet. Through adopting elastic buffer 20 to transmit the moment of torsion for elastic buffer 20 respectively with the transmission contact surface grow of first driving medium 10 and second driving medium 30, solved among the prior art between gear 10 and the volute spring and between volute spring and the ratchet 30 the problem of being connected colluding the easy fracture of claw, elastic buffer 20 preparation simple process, with low costs, transmission noise is little moreover, the easy operation of dismouting need not additionally to install safety protection part.
In this embodiment, the elastic buffer member 20 is annular, an outer circumferential surface of the elastic buffer member 20 is in elastic pressing surface contact with the first transmission member 10, and an inner circumferential surface of the elastic buffer member 20 is in elastic pressing surface contact with the second transmission member 30. Specifically, a first transmission member cylinder 11 is arranged on the inner end surface of the first transmission member 10, a second transmission member ring 31 is arranged on the outer end surface of the second transmission member 30, the second transmission member ring 31 is sleeved on the first transmission member cylinder 11, the elastic buffer member 20 is elastically extruded between the inner circular surface of the first transmission member 10 and the outer circular surface of the second transmission member ring 31, and the torque of the first transmission member 10 can be transmitted to the second transmission member 30 by using the static friction force between the inner circular surface of the first transmission member 10 and the outer circular surface of the elastic buffer member 20 and between the inner circular surface of the elastic buffer member 20 and the outer circular surface of the second transmission member ring 31. Alternatively, in other embodiments, both end surfaces of the elastic buffer 20 may be in pressing contact with the end surfaces of the first transmission member 10 and the second transmission member 30, respectively.
First driving medium 10, elastic buffer 20 and second driving medium 30 pass through fastening components fastening connection, fastening components includes fixed column 41 and bolt 43, first driving medium cylinder 11 is provided with well cavity, fixed column 41 sets up in the cavity intracavity of first driving medium cylinder 11, threaded hole has been seted up on fixed column 41, second driving medium 30 sets up the through-hole seted up on the terminal surface of second driving medium ring 31, bolt 43 passes behind the through-hole with threaded hole threaded connection, thereby with first driving medium 10 and the fastening connection of second driving medium 30, and the terminal surface of second driving medium 30 supports and presses on elastic buffer 20, thereby it is fixed with elastic buffer 20. Further, the fastening assembly further comprises a washer 42, and the washer 42 is arranged between the bolt head of the bolt 43 and the inner end face of the second transmission piece 30.
Preferably, the elastic buffer member 20 is made of a polyurethane elastomer, the polyurethane elastomer has 50% of compression amount and strong resilience, the polyurethane elastomer has the characteristics of pressure resistance, wear resistance, impact resistance, oil resistance, acid and alkali resistance and tear resistance, the basic requirements of the electric starting device on the elastic buffer member can be met, the hardness of the elastic buffer member can be selected from 25-98 degrees shore, the elastic buffer member can be selected according to extension tests of use space, load and the like, and the effect of the elastic buffer member on the most suitable use occasion can be comprehensively obtained. Optionally, the elastic buffer 20 may be made of acrylic rubber, which is also called polyurethane PU elastomer, and is a new material with good strength and small compression deformation between plastic and rubber, and has the rigidity of plastic and the elasticity of rubber. Of course, the material of the elastic buffer 20 is not limited to polyurethane elastomer, and may be common elastomer material, such as rubber material.
Preferably, the end faces of the elastomeric damper 20 are provided with chamfers to facilitate assembly of the elastomeric damper 20.
Preferably, a plurality of grooves 12 are formed in the inner circumferential surface of the first transmission member 10 at intervals along the circumferential direction, and the arrangement of the grooves 12 can increase the friction between the inner circumferential surface of the first transmission member 10 and the outer circumferential surface of the elastic buffer member 20, thereby increasing the transmission of the torque between the first transmission member 10 and the second transmission member 30.
Further, as shown in fig. 5, the geometric centre and the rotation median of the first transmission cylinder 11 are both located on the axis X; the geometric center of the elastomeric damper 20 is located on the axis Y, and the rotational center of the elastomeric damper 20 is located on the axis X; the geometric center of the second transmission member ring 31 is located on the axis Y, and the rotation center of the second transmission member ring 31 is located on the axis X, wherein the axis X and the axis Y are parallel to each other and are arranged at intervals. In the present embodiment, the inner circular surface of the first transmission member 10 is disposed eccentrically with respect to the outer circular surface, that is, the wall thickness of the first transmission member 10 gradually increases from one point to another point along the circumferential direction, and the first transmission member cylinder 11 is concentric with the outer circular surface of the first transmission member 10; the inner circular surface and the outer circular surface of the elastic buffer member 20 are concentrically arranged, that is, the elastic buffer member 20 is arranged with equal wall thickness along the circumferential direction; the inner circular surface of the second transmission member ring 31 is eccentrically arranged relative to the outer circular surface, that is, the wall thickness of the second transmission member ring 31 gradually increases from one point to another point along the circumferential direction, the thickest point of the wall thickness of the second transmission member ring 31 is opposite to the thinnest point of the wall thickness of the first transmission member 10, and the thinnest point of the wall thickness of the second transmission member ring 31 is opposite to the thickest point of the wall thickness of the first transmission member 10. Alternatively, in other embodiments, the outer circumferential surface of the elastic buffer member 20 is eccentrically disposed with respect to the inner circumferential surface, the inner and outer circumferential surfaces of the first transmission member 10 are concentrically disposed, and the outer circumferential surface of the second transmission member ring 31 is eccentrically disposed with respect to the inner circumferential surface. Alternatively still, in another embodiment, the inner circular surface of the elastic buffer member 20 is eccentrically disposed with respect to the outer circular surface, the inner circular surface of the first transmission member 10 is eccentrically disposed with respect to the outer circular surface, and the inner circular surface and the outer circular surface of the second transmission member ring 31 are concentrically disposed. Through the above arrangement, the static friction force between the inner circular surface of the first transmission member 10 and the outer circular surface of the elastic buffer member 20 and between the inner circular surface of the elastic buffer member 20 and the outer circular surface of the second transmission member ring 31 can be increased, and the torque transmitted between the first transmission member 10 and the second transmission member 30 can be further increased.
Referring to fig. 5, if the point on the axis Y is eccentrically located with respect to the point on the axis X, and the eccentricity is e, e is (L1-L2)/r, where L1 is the maximum distance from the rotation center of the elastic buffer 20 to the outer circle of the elastic buffer 20, L2 is the minimum distance from the rotation center of the elastic buffer 20 to the outer circle of the elastic buffer 20, and r is the inner circle radius of the elastic buffer 20. The eccentricity has a positive correlation with the friction force generated by the motion, the influence of the eccentricity on the performance of the elastic buffer member 20 mainly depends on the friction force to be transmitted, the friction force to be transmitted depends on the size of an external load, and the design requirement can be met as long as the transmitted friction force can be stably greater than the load. Preferably, the eccentricity e is 0.2 to 0.3. Further preferably, the eccentricity e is 0.28.
Further, the ratio of the inner circle radius to the outer circle radius of the elastic buffer member 20 is k, that is, k is R/R, where R is the inner circle radius of the elastic buffer member 20, R is the outer circle radius of the elastic buffer member 20, and the eccentricity e and the radius ratio k jointly determine the structural performance of the elastic buffer member 20. Preferably, k is 0.4 to 0.5. Further preferably, k is 0.46.
The actual starting test proves that the starting success rate of the electric starting device is high, and specifically, the test result is as follows: the starting experiment is actually carried out for 1220 times, the first starting is successful for 1201 times, the first starting is failed for 19 times, and the second starting after the failure is completely successful, namely the success rate of the first starting is greater than 98 percent and the success rate of the second starting is 100 percent.
The present embodiment also provides an electric starting apparatus including the above-described torque transmitting mechanism.
The embodiment also provides an electric starting engine which comprises the electric starting device.
The present embodiment also provides a garden tool including the above-described electric starter engine. In particular, the garden tool may be a lawnmower, a lawn mower, a brush cutter, a rooter, a pruner, a chain saw, a hedge trimmer, a suction blower, or the like.
Example two
The present embodiment provides a torque transmission mechanism, as shown in fig. 6-8, the torque transmission mechanism includes a first transmission member 10, a second transmission member 30 and an elastic buffer member 20 located between the first transmission member 10 and the second transmission member 30, wherein an inner circumferential surface of the first transmission member 10 and an outer circumferential surface of the elastic buffer member 20 are connected by a snap-fit manner, and an outer circumferential surface of the second transmission member 30 and an inner circumferential surface of the elastic buffer member 20 are connected by a snap-fit manner, through the snap-fit manner, when the first transmission member 10 transmits a torque, the first transmission member 10 transmits the torque to the elastic buffer member 20 first, the elastic buffer member 20 performs short-time buffering, and then the elastic buffer member 20 transmits the torque to the second transmission member 20, which can effectively solve the problem that the hook claw connected between the gear 10 and the volute spring and between the volute spring and the ratchet buffer member 30 is prone to break in the prior art, and the manufacturing process of the elastic buffer member 20 is simple, The cost is low, the transmission noise is small, the dismounting and the mounting are easy to operate, and additional installation of safety protection parts is not needed. In this embodiment, the first transmission member 10 is a gear, and the second transmission member 30 is a ratchet.
In this embodiment, referring to fig. 6, the elastic buffer 20 is an annular structure, and in this embodiment, a first engaging groove 201 is disposed on an outer peripheral surface of the elastic buffer 20, and correspondingly, a first engaging block 101 is disposed on an inner peripheral surface of the first transmission member 10, and the first engaging block 101 can be engaged with the first engaging groove 201, so as to achieve the engagement between the first transmission member 10 and the elastic buffer 20, so that the torque of the first transmission member 10 is transmitted to the elastic buffer 20. Optionally, at least two (three in fig. 6) first locking grooves 201 are provided in the first locking groove 201 of this embodiment, and at least two first locking grooves 201 are uniformly distributed on the outer peripheral surface of the elastic buffer 20, and correspondingly, the same number of first locking blocks 101 as the number of the first locking grooves 201 are provided on the inner peripheral surface of the first transmission member 10. By the arrangement of the at least two first engaging grooves 201 and the at least two first engaging blocks 101, the torque of the first transmission member 10 can be more stably transmitted to the elastic buffer 20.
Preferably, in this embodiment, the first locking groove 201 has a fan-shaped structure, and the width of the first locking groove 201 gradually increases along a direction in which the inner circumferential surface of the elastic buffer 20 points to the outer circumferential surface. The first latch 101 has a shape matching the first latch groove 201. The arrangement of the structure can enable the contact area between the first clamping block 101 and the first clamping groove 201 to be larger, so that the torque is transmitted more stably, and the short-time buffering effect of the elastic buffering part 20 is better.
Furthermore, in the embodiment, as shown in fig. 9, a first gap 102 is formed between the first fixture block 101 and the first clamping groove 201, and the first gap 102 may be formed between an end of the first fixture block 101 and a bottom of the first clamping groove 201, between a side wall of the first fixture block 101 and a side wall of the first clamping groove 201, between an end of the first fixture block 101 and a bottom of the first clamping groove 201, and between a side wall of the first fixture block 101 and a side wall of the first clamping groove 201. It may be formed between the outer circumferential surface of the elastic buffer 20 and the inner circumferential surface of the first transmission 10. The first gap 102 provides a space for elastic expansion and contraction of the elastic buffer member 20, and the elastic buffer effect of the elastic buffer member 20 is further improved.
As shown in fig. 6, a second engaging groove 202 is formed in an inner peripheral surface of the elastic buffer 20, and correspondingly, a second engaging block 301 is formed in an inner peripheral surface of the second transmission member 30, and the second engaging block 301 is engaged with the second engaging groove 202, so as to achieve engagement between the elastic buffer 20 and the second transmission member 30. In this embodiment, at least two (three in fig. 6) second locking grooves 202 may be provided, and two second locking grooves 202 are circumferentially and uniformly distributed on the inner circumferential surface of the elastic buffer 20, and correspondingly, second locking blocks 301 with the same number as that of the second locking grooves 202 are provided on the outer circumferential surface of the second transmission member 20. By arranging the at least two second clamping grooves 202 and the at least two second clamping blocks 301, after the elastic buffer member 20 receives the torque transmitted by the first transmission member 10, the torque can be transmitted to the second transmission member 30, so that the torque can be transmitted between the first transmission member 10 and the second transmission member 20.
In this embodiment, the second engaging groove 202 is also in a fan shape, and the width of the second engaging groove 202 gradually increases along the direction in which the inner circumferential surface of the elastic buffer 20 points to the outer circumferential surface. So that the contact area between the second latch 301 and the second latch groove 202 is larger, and the torque transmission effect is increased. In addition, the structure of the second engaging groove 202 can also make the engagement between the elastic buffer 20 and the second transmission member 30 more stable. As shown in fig. 9, in the present embodiment, a second gap 302 is formed between the second latch 301 and the second latch slot 202, and the second gap 302 may be formed between an end of the second latch 301 and a bottom of the second latch slot 202, between a side wall of the second latch 301 and a side wall of the second latch slot 202, between an end of the second latch 301 and a bottom of the second latch slot 202, and between a side wall of the second latch 301 and a side wall of the second latch slot 202. It may be formed between the inner circumferential surface of the elastic buffer member 20 and the outer circumferential surface of the second transmission member 30. The second gap 302 provides a space for elastic expansion and contraction of the elastic buffer member 20, and further improves the elastic buffering effect of the elastic buffer member 20.
In this embodiment, the elastic buffer 20 is made of a polyurethane elastomer, preferably a high-strength rubber, which is also called a polyurethane PU elastomer, and is a novel material having good strength and small compression deformation, and being between plastic and rubber, and having the rigidity of plastic and the elasticity of rubber.
The present embodiment also provides an electric starting apparatus including the above-described torque transmitting mechanism.
The embodiment also provides an electric starting engine which comprises the electric starting device.
The present embodiment also provides a garden tool including the above-described electric starter engine. In particular, the garden tool may be a lawnmower, a lawn mower, a brush cutter, a rooter, a pruner, a chain saw, a hedge trimmer, a suction blower, or the like.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (19)
1. A torque transmission mechanism is characterized by comprising a first transmission piece, a second transmission piece and an elastic buffer piece positioned between the first transmission piece and the second transmission piece, wherein the elastic buffer piece is configured to buffer and transmit the torque of the first transmission piece to the second transmission piece;
the elastic buffer part is annular, the outer peripheral surface of the elastic buffer part is in elastic extrusion surface contact with the first transmission part, and the inner peripheral surface of the elastic buffer part is in elastic extrusion surface contact with the second transmission part;
a first transmission piece cylinder is arranged on the inner end face of the first transmission piece, a second transmission piece ring is arranged on the outer end face of the second transmission piece, the second transmission piece ring is sleeved on the first transmission piece cylinder, and the elastic buffer piece is elastically extruded between the inner circular face of the first transmission piece and the outer circular face of the second transmission piece ring;
the geometric center and the rotation center line of the first transmission piece cylinder are both positioned on an axis X; the geometric center of the elastic buffer piece is positioned on an axis Y, and the rotation center of the elastic buffer piece is positioned on the axis X; the geometric center of second driving medium ring is located on axis Y, the center of rotation of second driving medium ring is located on axis X, wherein axis X with axis Y is parallel to each other and the interval sets up.
2. The torque-transmitting mechanism of claim 1, wherein a point on the axis Y has an eccentricity of 0.2-0.3 relative to a point on the axis X.
3. The torque transmitting mechanism of claim 2, wherein a point on the axis Y has an eccentricity of 0.28 relative to a point on the axis X.
4. The torque transmitting mechanism according to claim 1, wherein the ratio of the inner circular radius of the elastomeric damper to the outer circular radius of the elastomeric damper is 0.4-0.5.
5. The torque transmitting mechanism according to claim 4, wherein the ratio of the inner circular radius of the elastomeric damper to the outer circular radius of the elastomeric damper is 0.46.
6. The torque transmitting mechanism according to claim 1, wherein the first transmission member has a plurality of grooves formed in an inner circumferential surface thereof at intervals in a circumferential direction of the inner circumferential surface.
7. The torque-transmitting mechanism according to claim 1, wherein an end face of the elastic buffer is provided with a chamfer.
8. The torque transmitting mechanism according to claim 1, wherein an outer peripheral surface of the elastic buffer member is engaged with an inner peripheral surface of the first transmission member, and an inner peripheral surface of the elastic buffer member is engaged with an outer peripheral surface of the second transmission member.
9. The torque transmitting mechanism according to claim 8, wherein a first engaging groove is formed on an outer circumferential surface of the elastic buffer member, and a first engaging block is formed on an inner circumferential surface of the first transmission member, and the first engaging block is engaged with the first engaging groove.
10. The torque transmitting mechanism according to claim 9, wherein a first gap is formed between the first engaging piece and the first engaging groove, and/or between an outer circumferential surface of the elastic buffer and an inner circumferential surface of the first transmission member.
11. The torque transmitting mechanism according to claim 9, wherein the first engaging groove has a fan-shaped configuration, and a width of the first engaging groove gradually increases in a direction in which an inner circumferential surface of the elastic buffer faces the outer circumferential surface.
12. The torque transmission mechanism according to any one of claims 9 to 11, wherein a second engaging groove is formed on an inner peripheral surface of the elastic buffer, and a second engaging block is formed on an outer peripheral surface of the second transmission member, and the second engaging block is engaged with the second engaging groove.
13. The torque transmitting mechanism according to claim 12, wherein a second gap is formed between the second engaging piece and the second engaging groove, and/or between an inner peripheral surface of the elastic buffer and an outer peripheral surface of the second transmission member.
14. The torque transmitting mechanism according to claim 12, wherein the second engaging groove has a fan-shaped configuration, and a width of the second engaging groove gradually increases in a direction in which an inner circumferential surface of the elastic buffer faces the outer circumferential surface.
15. The torque transmitting mechanism according to claim 12, wherein there are at least two first engaging grooves, and the at least two first engaging grooves are circumferentially and uniformly distributed on the outer circumferential surface of the elastic buffer;
and/or the number of the second clamping grooves is at least two, and the at least two second clamping grooves are uniformly distributed on the inner circumferential surface of the elastic buffer part in the circumferential direction.
16. The torque transmitting mechanism according to claim 1, wherein the elastomeric damper is a polyurethane elastomer.
17. An electric starting device comprising a torque transmitting mechanism as claimed in any one of claims 1 to 16.
18. An electric starting engine, characterized by comprising the electric starting apparatus of claim 17.
19. A garden tool, comprising an electric starting engine as claimed in claim 18.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910765273.8A CN112392937B (en) | 2019-08-19 | 2019-08-19 | Torque transmission mechanism, electric starting device, engine and garden tool |
| PCT/CN2020/109473 WO2021032044A1 (en) | 2019-08-19 | 2020-08-17 | Torque transfer mechanism, electric starting device, engine and garden tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910765273.8A CN112392937B (en) | 2019-08-19 | 2019-08-19 | Torque transmission mechanism, electric starting device, engine and garden tool |
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| Publication Number | Publication Date |
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| CN112392937A CN112392937A (en) | 2021-02-23 |
| CN112392937B true CN112392937B (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910765273.8A Active CN112392937B (en) | 2019-08-19 | 2019-08-19 | Torque transmission mechanism, electric starting device, engine and garden tool |
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| Country | Link |
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| CN (1) | CN112392937B (en) |
| WO (1) | WO2021032044A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244014B (en) * | 2021-11-23 | 2023-01-24 | 宁波精成电机有限公司 | Split type reduction box motor |
| CN117489758A (en) * | 2023-10-23 | 2024-02-02 | 杭州以特智联科技有限公司 | Speed reducer convenient for gear clamping detection |
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Also Published As
| Publication number | Publication date |
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| CN112392937A (en) | 2021-02-23 |
| WO2021032044A1 (en) | 2021-02-25 |
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